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86 lines
1.9 KiB
86 lines
1.9 KiB
#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Digest::SHA qw (sha256);
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sub module_constraints { [[0, 127], [32, 32], [0, 31], [32, 32], [-1, -1]] }
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sub module_generate_hash
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{
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my $word = shift;
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my $id = shift;
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my $rest = shift;
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if (defined $id == 0)
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{
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$id = "0" x 32;
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}
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if (defined $rest == 0)
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{
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$rest = "127*";
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$rest .= "0" x 64;
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$rest .= $id;
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$rest .= "0" x 158;
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$rest .= "*127*00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000*32*0000000000000000000000000000000000000000000000000000000000000000*32*0000000000000000000000000000000000000000000000000000000000000000";
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}
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my @data = split /\*/, $rest;
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my $u = pack ("H*", $data[1]);
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my $h = sha256 ($word . substr ($u, 32, 8));
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$data[1] = unpack ("H*", $h . substr ($u, 32));
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$rest = join ("*", @data);
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my $hash = sprintf ('$pdf$5*5*256*-1028*1*16*%s*%s', $id, $rest);
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return $hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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# PDF 1.7 Level 3 (Acrobat 9)
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my ($hash_in, $word) = split ":", $line;
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return unless defined $hash_in;
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return unless defined $word;
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my @data = split /\*/, $hash_in;
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return unless scalar @data >= 11;
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return unless (shift @data eq '$pdf$5');
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return unless (shift @data eq '5');
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return unless (shift @data eq '256');
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return unless (shift @data eq '-1028');
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return unless (shift @data eq '1');
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return unless (shift @data eq '16');
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my $id = shift @data;
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my $rest = join "*", @data;
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return unless defined $id;
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return unless defined $rest;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $id, $rest);
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return ($new_hash, $word);
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}
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1;
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